Motion-imparting mechanism for bolter-sieves.



J. W. BARRETT. MOTION IMPARTING MECHANISM FOR BOLTER SIEVBS.

APPLIGATION FILED FEB.25, 1913.

Patented Jan. 6, 1914.

UNTTD STATES PATET @FFTQE.

J ARIES W. BARRETT, 0F BUFFALO, KENTUCKY.

MOTION-IMPAR'IING MECHANISM FOR BOLTER-SIEVES.

osaese.

Application filed February 25, 1913.

To all whom it may concern:

Be it known that I, JAMES W. BARRETT, a citizen of the United States, residing at Buffalo, in the county of Larue and State of Kentucky, have invented certain new and useful Improvements in Motion-Imparting Mechanism for Bolter-Sieves, of which the following is a specification.

It is common to impart a gyrating or shaking motion to bolter sieves by securing to the sieve box a crank shaft which is made fast at one or both ends to some fixed struc ture, such as a floor or ceiling. It is also common to impart such motion to these sieves by securing to the sieve box a shaft provided with one or more radial weights, and rotating said shaft, whereby the motion of the weights imparts the necessary gyrating motion to the sieve.

The present invention is directed more especially to improvements in the latter class of devices, and is designed to overcome some of the defects inherent in such devices as are now in use, as will more fully appear in the following detail description of my invention, in which reference will be had to the accompanying drawings wherein:

Figure 1, represents, in side elevation, a bolter sieve equipped with a form of my improved mechanism, which is shown partly in section; Fig. 2, an enlarged fragmentary sectional elevation of portions of my improved mechanism, and Fig. 3, a section on line 3 -3 Fig. 2, looking in the direction of the arrow.

Referring to the accompanying drawings, 1 represents a sieve box which we may as sume is of the usual type employed in flour mill bolters, said box being supported by rods 2, after the usual practice. My improved mechanism for imparting the required shaking or gyrating motion to this sieve box, comprises in the case shown, among other parts, a bracket in the form of a spider 8, having four legs made fast to the bottom of the sieve box, and a hub portion 4-, from which said legs radiate, said hub portion having a central bore 5, through which passes a shaft 6. This shaft is reduced in diameter, as at 7 and 8, on each side of the central portion which rotates within the hub 4, forming between the reduced portions and the central portion of the shaft shoulders 9 and 10, respectively. These shoulders form portions of ball bearings which include balls 11 and 12, and re- Specification of Letters Patent.

Patented Jan. 6, 31914.

Serial No. 750,667.

movable caps 18 and 14,.fitting over flanges 15 and 16 of the bracket, and bolted thereto as shown.

The gyrating or shaking motion in this device is effected by two weights 17 and 18, made fast, respectively, on two arms 19 and 20, extending transversely through the portions 7 and 8, of the shaft 6, and adjustably secured thereto by set screws 21, provided with lock nuts 22. Rotation is imparted to shaft 6 through a belt 23, operating on a pulley 24, fast on the upper end of shaft 6, said belt passing over idler 25, thence to any suitable driving means. By

loosening the set screws 21, the distance of the weights 17 and 18, from the axis of shaft 6, may be varied, thereby adjusting the gyrating motion of the device. There is no direct connection between the shaft 6, and the sieve box, and this shaft is freely movable with the sieve box; that is, it does not extend up to and in engagement with the sieve box and is connected to no fixed structure such, for example, as the floor or ceiling. The shaft 6 is also very short, being preferably no more than about 18 inches long, and about ten inches between ball bearings. The idea of having this shaft entirely out of engagement with the sieve box, not passing through said box, nor connected to the floor or ceiling, is extremely advantageous, since there is no likelihood of fire, due to the sieve box becoming ignited from a hot shaft or hearing, the bearing being far enough removed from the box to remove all likelihood of such accident. Such an arrangement also obviates the jarring and knocking which results in devices wherein the shaft which imparts the gyrating motion is attached to some fixed structure such as the floor. Moreover, by locating the weights close together, as in my device, the same motion may be obtained with smaller weights than usual, thereby requiring less power to operate the mechanism, and the location of the weights on each side of the bearings, as shown, close together insures a much better balanced and easier running mechanism than those heretofore employed.

In addition to the foregoing advantages, my improved mechanism is characterized by its great simplicity, and the ease with which the working parts may be reached while the machine is in operation.

lVhile I have herein described but one specific embodiment of my said invention, it

will be understood that modifications thereof ay be made, and still be within the scope of the invention. I

What I claim as my invention is:

1. The combination with a movably supported sieve box, of a bracket secured to the lower side thereof, and provided with a shaft supporting hub, a vertical shaft journaled in said hub and wholly below said sieve box, two arms secured to said shaft on opposite sides of said hub and extending transversely of said shaft, and a weight carried by each of said arms, the said shaft being freely movable bodily with the sieve.

2. The combination with a movably supported sieve box, of a bracket secured to the lower side thereof, a vertical shaft wholly below said sieve box, bearings supporting said shaft in said bracket, two arms secured to said shaft on opposite sides of said bearings and extending transversely of said shaft, and a weight carried by each of said arms, the said shaft being freely movable bodily with the sieve.

3. The combination with a m-ovably supported sieve box, of a bracket secured to the lower side thereof, a vertical shaft supported in said bracket'and having a spindle at each end and a shoulder adjacent each spindle, ball bearings engaging said shoul ders, the said shaft being wholly below said box, two arms secured to said shaft on op posite sides of said bearings and extending transversely of said shaft, a weight carried by each of said arms, the said shaft being freely movable bodily with the sieve, and mechanism for rotating said shaft.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES -W. BARRETT.

WVitnesses C. E. KEITIi, E. W. KEITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

